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17 October 2012 Understanding fiber Bragg gratings at harmonics of the Bragg wavelength through spectra and images
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84211Z (2012) https://doi.org/10.1117/12.974804
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
Abstract
Fiber Bragg gratings written using a phase-mask exhibit a complex refractive index pattern in the fiber core, as observed in differential interference contrast (DIC) microscopy. This results in dual periodicities along the fiber core and gratings at both the Bragg wavelength, twice the Bragg wavelength, and the harmonics of these. Features in grating spectra arise from one or both of these periodicities and spectra for twice the Bragg wavelength (or its odd harmonics) are very sensitive to the details of how the UV complex diffraction field of the phase mask becomes imprinted as refractive index changes in the fiber core.
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Stephen F. Collins, Scott A. Wade, Fotios Sidiroglou, and Greg W. Baxter "Understanding fiber Bragg gratings at harmonics of the Bragg wavelength through spectra and images", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84211Z (17 October 2012); https://doi.org/10.1117/12.974804
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